CWE-347
Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
CVE-2026-25793 (GCVE-0-2026-25793)
Vulnerability from cvelistv5 – Published: 2026-02-06 22:55 – Updated: 2026-02-09 15:25
VLAI
Title
Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability
Summary
Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.
Severity
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/slackhq/nebula/security/adviso… | x_refsource_CONFIRM |
| https://github.com/slackhq/nebula/commit/f573e8a2… | x_refsource_MISC |
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CVE-2026-25922 (GCVE-0-2026-25922)
Vulnerability from cvelistv5 – Published: 2026-02-12 19:38 – Updated: 2026-02-17 16:19
VLAI
Title
authentik has a Signature Verification Bypass via SAML Assertion Wrapping
Summary
authentik is an open-source identity provider. Prior to 2025.8.6, 2025.10.4, and 2025.12.4, when using a SAML Source that has the option Verify Assertion Signature under Verification Certificate enabled and not Verify Response Signature, or does not have the Encryption Certificate setting under Advanced Protocol settings configured, it was possible for an attacker to inject a malicious assertion before the signed assertion that authentik would use instead. authentik 2025.8.6, 2025.10.4, and 2025.12.4 fix this issue.
Severity
8.8 (High)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/goauthentik/authentik/security… | x_refsource_CONFIRM |
| https://github.com/goauthentik/authentik/releases… | x_refsource_MISC |
| https://github.com/goauthentik/authentik/releases… | x_refsource_MISC |
| https://github.com/goauthentik/authentik/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| goauthentik | authentik |
Affected:
< 2025.8.6
Affected: >= 2025.10.0-rc1, < 2025.10.4 Affected: >= 2025.10.0-rc1, < 2025.12.4 |
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CVE-2026-2625 (GCVE-0-2026-2625)
Vulnerability from cvelistv5 – Published: 2026-04-03 18:38 – Updated: 2026-05-01 21:13
VLAI
Title
Rust-rpm-sequoia: rust-rpm-sequoia: denial of service via crafted rpm file during signature verification
Summary
A flaw was found in rust-rpm-sequoia. An attacker can exploit this vulnerability by providing a specially crafted Red Hat Package Manager (RPM) file. During the RPM signature verification process, this crafted file can trigger an error in the OpenPGP signature parsing code, leading to an unconditional termination of the rpm process. This issue results in an application level denial of service, making the system unable to process RPM files for signature verification.
Severity
4 (Medium)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:12682 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-2625 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2440357 | issue-trackingx_refsource_REDHAT |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images |
Unaffected:
1.10.1.1-1.2.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
Date Public
2026-02-17 12:34
Credits
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CVE-2026-27445 (GCVE-0-2026-27445)
Vulnerability from cvelistv5 – Published: 2026-03-04 08:47 – Updated: 2026-03-04 19:26
VLAI
Title
PGP Signature Reflection
Summary
SEPPmail Secure Email Gateway before version 15.0.1 does not properly verify that a PGP signature was generated by the expected key, allowing signature spoofing.
Severity
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://downloads.seppmail.com/extrelnotes/150/ER… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SEPPmail | Secure Email Gateway |
Affected:
0 , < 15.0.1
(custom)
|
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CVE-2026-2746 (GCVE-0-2026-2746)
Vulnerability from cvelistv5 – Published: 2026-03-04 08:44 – Updated: 2026-03-04 21:26
VLAI
Title
Missing PGP Signature Tag
Summary
SEPPmail Secure Email Gateway before version 15.0.1 does not properly communicate PGP signature verification results, leaving users unable to detect forged emails.
Severity
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://downloads.seppmail.com/extrelnotes/150/ER… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SEPPmail | Secure Email Gateway |
Affected:
0 , < 15.0.1
(custom)
|
Credits
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CVE-2026-27962 (GCVE-0-2026-27962)
Vulnerability from cvelistv5 – Published: 2026-03-16 17:34 – Updated: 2026-03-18 03:55
VLAI
Title
Authlib JWS JWK Header Injection: Signature Verification Bypass
Summary
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization function, the library extracts and uses the cryptographic key embedded in the attacker-controlled JWT jwk header field. An attacker can sign a token with their own private key, embed the matching public key in the header, and have the server accept the forged token as cryptographically valid — bypassing authentication and authorization entirely. This issue has been patched in version 1.6.9.
Severity
9.1 (Critical)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/authlib/authlib/security/advis… | x_refsource_CONFIRM |
| https://github.com/authlib/authlib/commit/a5d4b2d… | x_refsource_MISC |
| https://github.com/authlib/authlib/releases/tag/v1.6.9 | x_refsource_MISC |
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CVE-2026-28432 (GCVE-0-2026-28432)
Vulnerability from cvelistv5 – Published: 2026-03-09 21:19 – Updated: 2026-03-10 14:45
VLAI
Title
HTTP signature verification can be bypassed
Summary
Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.
Severity
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/misskey-dev/misskey/security/a… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| misskey-dev | misskey |
Affected:
< 2026.3.1
|
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CVE-2026-28802 (GCVE-0-2026-28802)
Vulnerability from cvelistv5 – Published: 2026-03-06 06:44 – Updated: 2026-03-06 16:05
VLAI
Title
Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification
Summary
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Severity
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/authlib/authlib/security/advis… | x_refsource_CONFIRM |
| https://github.com/authlib/authlib/commit/a61c2ac… | x_refsource_MISC |
| https://github.com/authlib/authlib/commit/b87c32e… | x_refsource_MISC |
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CVE-2026-29000 (GCVE-0-2026-29000)
Vulnerability from cvelistv5 – Published: 2026-03-04 21:49 – Updated: 2026-05-11 23:11
VLAI
Title
pac4j-jwt JwtAuthenticator Authentication Bypass
Summary
pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.
Severity
9.1 (Critical)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.pac4j.org/blog/security-advisory-pac4… | vendor-advisory |
| https://www.codeant.ai/security-research/pac4j-jw… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/pac4j-jwt-jw… | third-party-advisory |
Impacted products
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CVE-2026-2968 (GCVE-0-2026-2968)
Vulnerability from cvelistv5 – Published: 2026-02-23 03:02 – Updated: 2026-02-23 17:26 X_Open Source
VLAI
Title
Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification
Summary
A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.347335 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.347335 | signaturepermissions-required |
| https://vuldb.com/?submit.757091 | third-party-advisory |
| https://github.com/dwBruijn/CVEs/blob/main/Mongoo… | related |
| https://github.com/dwBruijn/CVEs/blob/main/Mongoo… | exploit |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cesanta | Mongoose |
Affected:
7.0
Affected: 7.1 Affected: 7.2 Affected: 7.3 Affected: 7.4 Affected: 7.5 Affected: 7.6 Affected: 7.7 Affected: 7.8 Affected: 7.9 Affected: 7.10 Affected: 7.11 Affected: 7.12 Affected: 7.13 Affected: 7.14 Affected: 7.15 Affected: 7.16 Affected: 7.17 Affected: 7.18 Affected: 7.19 Affected: 7.20 cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:* |
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No mitigation information available for this CWE.
CAPEC-463: Padding Oracle Crypto Attack
An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.
CAPEC-475: Signature Spoofing by Improper Validation
An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.